Python POST request says "Not Acceptable!"

Question

My school has a website that students can sign up for classes during a study period and I forget all the time. I'm trying to make a script that logs in and signs up for me. This is what I have:

import requests
payload = {
 "username": "",
 "pwd": "",
 "User-Agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.135 Safari/537.36 Edge/12.246"
}
with requests.Session() as s:
 p = s.post('http://www.bloomingtonsouth.org/plus/login.php', data=payload)
 print(p.text)
 r = s.get('http://www.bloomingtonsouth.org/plus/student.php')
 print(r.text)

The output: "Not Acceptable!

Not Acceptable!

An appropriate representation of the requested resource could not be found on this server. This error was generated by Mod_Security.

Not Acceptable!

Not Acceptable!

An appropriate representation of the requested resource could not be found on this server. This error was generated by Mod_Security.

"

What am I doing wrong?

Edit 1:

headers = {
 "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9",
 "Accept-Encoding": "gzip, deflate",
 "Accept-Language": "en-US,en;q=0.9",
 "Cache-Control": "max-age=0",
 "Connection": "keep-alive",
 "Host": "bloomingtonsouth.org",
 "Referer": "http://bloomingtonsouth.org/plus/login.php",
 "Upgrade-Insecure-Requests": "1",
 "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.117 Safari/537.36"
 }
url = "http://www.bloomingtonsouth.org/plus/login.php"
payload = {"username": "", "password": "", "submitted":"TRUE"}
post = requests.post(url, headers=headers, data=payload)
r = requests.get('http://www.bloomingtonsouth.org/plus/student.php')
print(r.text)

I tried this, using the headers I found the browser using and it still doesn't work.

• IMCoins: You need to check with the API owner or their documentation, it doesn't seem to be related to the requests library.
• gabhijit: There are a multiple things that server may expect - "Content-Type" header is properly set? Also, can you also post response code? r.status_code. That might give some indication. If it's 403 - likely your credentials are not right, if it's something else it can then be debugged.
• faefas: @gabhijit The response code is 406
• riemann_lebesgue: if you still can't get it to work, you can workaround using selenium / headless browser, although it's more effort than requests.

Answer 1

User-agent needs to be a header, not in the payload.

login()
def login():
 headers = headers - {"User-Agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.135 Safari/537.36 Edge/12.246"}
 url = "http://www.bloomingtonsouth.org/plus/login.php"
 payload = {"username": "", "pwd": ""}
 post = requests.post(url, headers=headers, data=payload)

try this code for logging in and let me know if it doesn't work.

• faefas: No, I still get "Not Acceptable!"
• gabhijit: webhostingmedia.net/http-error-406-not-acceptable This is likely cause. The way to debug this problem is - Try to submit form through a browser and then try to get same set of headers as are sent by browser.

Answer 2

If you have the full url to login you could use this online tool that converts URL to python request:

https://curl.trillworks.com/

If you don't understand the website post full url please.